Piston-replacing device.



PATENTED APR. 16, 1907 C. J. RICHARDSON.

PISTON REPLACING DEVICE.

APPLICATION FILED JULY 28, 1906.

Svuguil'oc I czwmzewlmrdm UNITED STATES -PA'J-ENT- O CE PISTON-REPLACING DEVICE.

Specification of Letters Patent.

'ratenteoi April 16, 1907.

' Application filed July 28,1906. Serial No. 328,267-

invented new and useful Improvements in Piston-ReplacingDevices, of which the follovIving is a specification.

' l tthe operation of cleaning air-brakes it is cos Omary to remove the brake-piston from the cylinder and thoroughly cleanse the interior of the latter by wiping it with waste and kerosene-oil, care being taken tothoroug'hly scrape and clean the leaky groove. Before .re lacing the piston the packingleather is t oronghly cleaned with oily waste, as is also the ex ander-ring, which serves to expand the leat er within the cylinder. In replacing the parts the ring is first applied within the packing-leather and the latter worked into the end of the cylinder, it being essential-that the true circular formation of the ring be preserved, or otherwise holes will be rapidly worn in the leather, due to an un equal pressure thereof against the walls of the cylinders under the influence of thering. Under the present mode of cleaning and reassembling the parts there is great liability of the ring becoming bent out of true as a result of the diflicu'lty experienced in properly returning the leather into the cylinder, in consequence of which the leather rapidly wears unequally, as before, stated, resulting in leaky defcctive brakes.

This invention relates to devices designed for use in replacing the pistons, and has for its objects to produce a comparatively simple inexpensive. device of this character which may in practice be conveniently ma nipulated, one whereby the operation of returning the packing-leather to the cylinder is facilitated, and one in which liability of the leather being misshaped or the ring bent out of true is wholly obviated.

. With these and other objects in view the invention comprises the novel features of construction and combination of parts more fully hereinafter described.

In the accompanying drawings, Figure 1 is a side elevation, partly in section, oi an airbrake cylinder and piston, showing my improved device applied for use in the operation of returning the piston to the cylinder. Fig. 2 is a front edge view of the device. Fig. 3 is a section through the stem, taken on the line 3 3 of Fig. 2.

. Referring to the drawings, 1 designates a brake-cylinder adapted to receive a pistonhead 2,provided with a tubular sleeve 3, arranged for sliding movement on a rod 4 and to be moved to released position under the influence of a s ring 5, coiled upon the. rod between the cylinder-head 6 and piston 2, which latter is equipped- With a packingleather 7, having arranged therein an expander-ring. (Not shown.) These parts are all of the usual construction and material and adapted in practice to perform their ordinary functions.

The replacing device embodying the invention comprises a split ring 8, having a thin forwardly-projecting entrance portion or flange 9, between which and the ring there is formed an external marginal shoulder 10, constituting an abutment for limiting the eninder, the ring 8 being composed of a pair of semicircular members or sections 11, having one pair of their meeting ends hing'cdly conncctcd, as at 12, whereby the sections may be 'moved relatively to open or closed position.

other or movable ends 'are members 13, having outwardly-projccting portions o r cars 14, adapted to receive a locking member or bolt 15, threaded for the reception of a thumbnut 16, one of the cars 14 being slotted, as at 17, to permit ready disengagement of the bolt therefrom when the thumb-nut 16 is loosened.

In practicc after the piston has been removcd from thc cylindcr and. cleaned and it is desired to return the same to the cylinder thumb-nut l6 and disengaging the bolt from the section 1 l, which has the slotted car1 4, 'and is thereafter applied around the packinglcather 7, it being understood that the expander-ring is arranged within the leather before application of thc ring 8. The replacing-ring having been applied around the same, the llangc 9 is inserted in the open end of cylinder 1 for carrying the leather into the latter, after whichthe thumb-nut 16 is again manipulated for releasing the sections of the ring, which is then withdrawn from the cylinder and removed from around the packinglcather. 'lhc )iston .5 may then be shoved into the cylim or and this without disorder- 1 ing the packing-leather or the expander-ring trance of the portion or flange 9 into the cyl' l thc ring 8 is opened by loosening the Attached to the sections 11 adjacent their packing-lmithcr for properly compressing the contained therein. It is to be rticularly observed that through the med iiim of my improved device the piston,may be conven I tions in active 2 A iston-replacing device comprising a band a a'p table to embrace the iston-head and Consisting of a pair of hinge -connected sections, and means for locking the sec osition, said band being provided with a orwardl projectin marginal flange designed to enter the end 0? der and with a-stop-shoulder for limiting the entrance ofthe flange. I

In testimony whereof I affix my signature in presence of two Witnesses.

g CHARLES J. RICHARDSON;

Witnesses: I

1 vWM. TAYLOR, J12,

JOHN J. CARLIN.

the cylin- V 

